SOLUTION: A coin is flipped twice. What is the probability that one head and one tail will occur?

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Question 469918: A coin is flipped twice. What is the probability that one head and one tail will occur?
Answer by Edwin McCravy(20054) About Me  (Show Source):
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A coin is flipped twice. What is the probability that one head and one tail will occur? 



P[(head 1st AND tail 2nd) OR (tail 1st AND head 2nd)]

AND means to multiply probabilities and OR means to ADD probabilities

P(heads 1st)×P(tails 2nd) + P(tails 1st)×P(heads 2nd)


All the probabilities are 1%2F2, so

1%2F2×1%2F2 + 1%2F2×1%2F2 = 1%2F4 + 1%2F4 = 2%2F4 = 1%2F2

Edwin